Hypodermic syringe



Nov. 5,Y 1.929. H. K. BRowN- HYPODERMIC SYRINGE Filed D66. 16. 1927 Patented Nov. 5, i929 naar HENRY K'. BROWN, 0F CHICAGO, ILLINOIS, ASSIGNOR TO COOK LABORATORIES, INC., OF i CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE HTYPODERMIC sYRrNGE Application led December 16, 1927. Serial No. 240,387.

This invention relates to hypodermic syringes of the kind embodying a cartridge and cartridge-piercing needle in an assembled injection-administering organization.

The invention will be explained by referenceto an illustrative embodiment thereof shown in the appended drawings.

In said drawings: Fig. 1 is a longitudinal sectional view of a syringe or injection-administering organization comprising or containing the illustrative .embodiment of the invention;

Fig. 2 is a front end view of the cartridge embodied in said syringe;

l5 Fig. 3 isa side elevation of said cartridge, with the front portion thereof shown in section;

Fig. 4 is across section on the line 4 4 jof Fig. 1\ looking in the direction of the arrow. Referring to the cartridge, 1 denotes a glass cartridge tube, preferably-fa section of commercial glass tubing. This tubenear its fore end is beaded lat 2 and 3 to provide internal annular ribs or shoulders.l Confined between said shoulders is a stopper 4 of suitable material such forv instance -as soft rubber adapted to. be pierced by a needle and to seal around the same. In effect the internal shoulders provided by the beaded. glass tube form a. socket between them, to receive the stopper which is held in said socket so as to resist inward or outward displacement. The .stopper may be a simple plug orl disc of resilient material "compressed in the tube and snapped into its seat and eifectually sealing A the tube.. Inl the opposite end of the tube is a stopper 5 .which may be of similar material. Said stopper 5 in this instance functions as a sealing-closure-and also `as a piston'plug toI be forced inwardly to expel the lfluid contents of the cartridge through the needle piercing the l stop'per 4.

In thesyringe or injection-administering organization exemplified in Fig. 1, the cartridge is held in a holder represented in this instance by a tubular-like instrument body 6.

Removably aiixed to the head of said body or cartridge holder is a double-pointed hypodermic needle 8,'which is mounted in an axial v o0 bore of said head, the inner end of said needle protruding into the holder and piercing the stopper 4. The front end of the glass cartridge tube abuts against an annular gasket 9 of rubber or the like fitted in the holder against the inner Side of the head 7. In operation the plunger lO is forced into the cartridge tube, driving in the plug 5 and forcibly expelling the medicament Huid through the needle. In this action the end of the glass tube is cushioned against thrust and protected by the sufliciently thick rubber gasket 9, and the stopper 4 by virtue of its tight hold in the socket provided between the annular beads 2 and 3 is mechanically interlocked with theV glass tube so as to resist displacement in the fluid-ejecting action.

The particular instrument selected for illus.

tration has-adet'achable breech head 11 in which the plunger'rod 10 is slidably fitted, said head in this instance having a screw-cap 12 secured thereto by welding or otherwise f and screwed upon the rear end of the instrument body. The cartridge may be inserted endwise into theinstrument when the breech head with the parts carried thereby is removed-.fv The inner end ofthe breech head 10, which is recessed to. enclose the enlarged inl ner end or head of the plunger rod; is adapted to bear on the rear end of the cartridge tube and( thus pushthe cartridge into place withits fore end against the gasket 9. The piero: ing of the stopper 4 may beaccomplished by pushing the cartridge into place after the needle is axed, or by pushing 4in and aixing the needle after the cartridge is inserted and held by the breech head. As shown, thel needle has an intermediate enlargement .13

seated on the end of the screw-threaded nipple extension 14 and secured by the screwcap 15. l,

I claim as my invention:

1. A hypodermic syringe comprising a cartridge having a sealing closure tov be'pierced by and seal around a needle and constructed to be reduced in interior volume for ejecting the fluid contents through the needle, said cartridge embodying a glass tube beaded near its fore end to provideI internal annular shoulders and said closure consisting of a resilient stopper tightly fitted inthe tube be- "zo I.

tween and in engagement with said shoulders and thereby mechanically interlocked with the tube; in ycombination with means includs ing said needle to provide an injection-ad- 5 ministering organization.

s 2. A syringe cartridge embodying a glass tube beaded near its fore end to provide ini ternal annular shoulders, and having apierceable sealing stopper of resilientv material tightly fitted in the tube and retained between saidshoulders, the cartridge being construoted to have its interior volume reduced for expelling the fluid contents through a Aneedle thrust through said stopper. v

In testimony whereof, I have signed my name to this specication.

' HENRY K. BROWN. 

